{"id":"CVE-2026-99054","aliases":[],"cve":{"records":[{"id":"CVE-2026-99054","source":"Linux","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-09-25T10:25:14.388Z","published":"2026-10-23T12:22:36.886Z","modified":"2026-10-30T12:41:21.256Z"}],"publishers":[{"name":"Linux","role":"CNA","organizationId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","modified":"2026-10-30T12:41:21.256Z"}],"references":[{"url":"https://git.kernel.org/stable/c/09dbd610f78aaed65d7b379c270ce4090a8151ac","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/21622e5ae8b232c2e64eb1adf5546cf078d2987d","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/7167afaaaee37191f8b6afa0c91e0fef41460705","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/7f796bb3b440d7f1b14c0e3b520462eb34f553af","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/da9c16568bc79140a54c1f5fcf07a0305df47b37","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/0af8780bdfdfc91fb9127bddb9c48fab67dc9d9e","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/fb717c536af2aafeca520ff11d1e0f25f7ab8fa9","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/3acdd44385bc7e2e57605e073691ce69cc5a960d","tags":[],"source":"Linux"}],"weaknesses":[],"applicability":[{"source":"Linux","statements":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.11","versionEndExcluding":"5.10.273"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.11","versionEndExcluding":"5.15.224"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.11","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.11","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.11","versionEndExcluding":"6.12.113"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.11","versionEndExcluding":"6.18.57"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.11","versionEndExcluding":"7.2.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.11","versionEndExcluding":"7.3"}]}]}]}],"prioritization":[]},"title":"tipc: destroy topsrv workqueues before closing connections","titleSource":"Linux","descriptionSource":"Linux","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: destroy topsrv workqueues before closing connections\n\ntipc_topsrv_stop() closed subscriber connections while the topology\nserver's send and receive workqueues were still running. Socket\ncallbacks and subscription events could then queue more work, and\nin-flight send/recv work could drop the last connection reference\nduring the conn_idr walk.\n\nThat race produced several teardown failures: refcount_t addition on\n0 from conn_get() on a connection whose release was blocked on\nidr_lock, a subsequent use-after-free in tipc_conn_close(),\nqueue_work() on an already destroyed workqueue from the listener\ndata-ready callback, and an RCU stall in tipc_topsrv_exit_net()\nwhile the walk spun under idr_lock.\n\nClear srv->listener under idr_lock so it acts as a shutdown flag,\nskip queue_work() once it is NULL, destroy the workqueues to flush\nin-flight work, and only then close the remaining connections.\nRefuse tipc_conn_lookup() after that flag is cleared, and drop\nidr_lock when the teardown walk finds no connection, so an\nin-flight subscription event cannot pin idr_in_use while the\nwalk holds the lock.\n\nv3 supersedes the narrower in-thread diff Tung Quang Nguyen\nposted on 2026-09-23. It keeps his teardown order and adds the\nlookup refusal and the empty-idr unlock.","score":7.8,"severity":"high","published":"2026-10-23T12:22:36.886Z","modified":"2026-10-30T12:41:21.256Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"Linux","name":"Linux","platforms":[],"versions":[{"version":"c5fa7b3cf3cb22e4ac60485fc2dc187fe012910f","status":"affected","lessThan":"09dbd610f78aaed65d7b379c270ce4090a8151ac","versionType":"git"},{"version":"c5fa7b3cf3cb22e4ac60485fc2dc187fe012910f","status":"affected","lessThan":"21622e5ae8b232c2e64eb1adf5546cf078d2987d","versionType":"git"},{"version":"c5fa7b3cf3cb22e4ac60485fc2dc187fe012910f","status":"affected","lessThan":"7167afaaaee37191f8b6afa0c91e0fef41460705","versionType":"git"},{"version":"c5fa7b3cf3cb22e4ac60485fc2dc187fe012910f","status":"affected","lessThan":"7f796bb3b440d7f1b14c0e3b520462eb34f553af","versionType":"git"},{"version":"c5fa7b3cf3cb22e4ac60485fc2dc187fe012910f","status":"affected","lessThan":"da9c16568bc79140a54c1f5fcf07a0305df47b37","versionType":"git"},{"version":"c5fa7b3cf3cb22e4ac60485fc2dc187fe012910f","status":"affected","lessThan":"0af8780bdfdfc91fb9127bddb9c48fab67dc9d9e","versionType":"git"},{"version":"c5fa7b3cf3cb22e4ac60485fc2dc187fe012910f","status":"affected","lessThan":"fb717c536af2aafeca520ff11d1e0f25f7ab8fa9","versionType":"git"},{"version":"c5fa7b3cf3cb22e4ac60485fc2dc187fe012910f","status":"affected","lessThan":"3acdd44385bc7e2e57605e073691ce69cc5a960d","versionType":"git"}],"defaultStatus":"unaffected","cpes":[],"source":"Linux","url":"https://www.cve.org/CVERecord?id=CVE-2026-99054"},{"vendor":"Linux","name":"Linux","platforms":[],"versions":[{"version":"3.11","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.11","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.113","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.57","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.11","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"defaultStatus":"affected","cpes":[],"source":"Linux","url":"https://www.cve.org/CVERecord?id=CVE-2026-99054"}],"remediation":[],"references":["https://git.kernel.org/stable/c/09dbd610f78aaed65d7b379c270ce4090a8151ac","https://git.kernel.org/stable/c/21622e5ae8b232c2e64eb1adf5546cf078d2987d","https://git.kernel.org/stable/c/7167afaaaee37191f8b6afa0c91e0fef41460705","https://git.kernel.org/stable/c/7f796bb3b440d7f1b14c0e3b520462eb34f553af","https://git.kernel.org/stable/c/da9c16568bc79140a54c1f5fcf07a0305df47b37","https://git.kernel.org/stable/c/0af8780bdfdfc91fb9127bddb9c48fab67dc9d9e","https://git.kernel.org/stable/c/fb717c536af2aafeca520ff11d1e0f25f7ab8fa9","https://git.kernel.org/stable/c/3acdd44385bc7e2e57605e073691ce69cc5a960d"],"sources":[{"name":"CVE","id":"CVE-2026-99054","modified":"2026-10-30T12:41:21.256Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-99054"}],"assessments":[{"source":"Linux","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8}],"sourceAffected":[],"observedAt":"2026-10-30T13:11:28.317Z","kev":{"status":"not-listed","checkedAt":"2026-11-15T02:25:31.038Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[],"aiSummary":null}